Greetings to all! I've never posted here before, but I have a sound problem that needs solving and didn't even consider posting elsewhere. I knew I'd get good responses here!If there's such a thing as a good problem, then that's what I've got. I have an excessive amount of low-end capability---that is, relative to the FOH volume levels that we typically run at the church where I oversee sound. In short, we have a pair of JBL PRX615M powered speakers for FOH and two JBL STX828S subs. One sub is powered by a Crown XTi4002 (3,200 watts bridged) and the other by a Crest Pro8200 (4,500 watts bridged). For the time being, we set up each week in a school auditorium that seats around 800 or 900, and the acoustics are decent, but not great. I'd like to be able to feel the bass (up front near the subs, not in the back...we're not aiming to be that loud). The only two sources that really drive the subs are kick drum and bass guitar. I DO NOT want either the kick or electric bass to overtake the mix at the expense of everything else, since I'm looking for balanced sound. I've considered acquiring 1/3 octave EQ's or perhaps parametric EQ's so that I can boost a narrow band of specific low frequencies for the kick and bass, with the hope of creating a palpable low frequency thump while keeping the overall (or apparent) volume of the overall mix at reasonable levels.Am I on the right track, or is there a better way to put this subwoofer power to good use? Or, do I just have a lot more bass capacity than I can use?Thanks in advance for your suggestions.Leonardo
By using these two amplifiers you are getting different output from both speakers.XTI has a DSP unit in it, and will have some latency. Crest doesn't have this. Have you ever tried running both subs form one of these amps in stereo mode ? You will loose som power of course, but it may be much beter sounding.
We started out with just the Crown amp and one STX828, in addition to using a PRX618S (single 18" driver, self powered) that we had from an earlier purchase. Via an Architectural Acoustics signal processor, I sent one feed to the little sub at 0dB and a separate signal to the STX828 at -6dB, since this sub combination was so lopsided power-wise. While waiting for the second STX828 to arrive---the one that has not even been used yet---I tried just the existing STX828 without the PRX sub, and I increased the feed from -6dB to 0dB. That's when I realized I was going to have a challenge harnessing the power of two of these things! With just the one and the 6dB input increase, the LF output was massive relative to everything else. Perhaps by selectively boosting some very low frequency from the kick or bass guitar (probably kick, I would think), I'd be able to get a powerful thump from the subs but without having to raise the higher frequencies too much. I've also thought about a sub-harmonic synthesizer. I've never used one, and I'm doubtful that such a thing is going to help. Another thing I've considered doing is using the Architectural Acoustics processor to cut everything below 50Hz. Our music doesn't have any significant content below that frequency anyway, and I believe that signals below 50Hz from the kick and bass guitar just add to the boominess. But there goes my idea of boosting very low frequencies!
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